Stone grinding or polishing machine



(No Model.) 3 SheetsSheet 1.

J. LAVERS. STONE GRINDING 0R POLISHING MACHINE.

Patented Aug. 7, I894.

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J LAYERS. STONE GRINDING 0R POLISHING MACHINE.

No. 524,091. Patented Aug. 7, 18,194.

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J LAYERS STONE GRINDING ORPOLISHING MACHINE.

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g UNITED ST TES "PATENT OFFICE.

JOHN. LAVERS," on corner, MASSACHUSETTS.

STONE GRINDING OR POFLISHING MACHINE.

SPECIFICATION forming part of Letters Patent No. 524,091, dated August 7,1894.

' Application filed May 18, 1894. Serial No. 511,639. (No model.)

Machines, of which the following, taken in connection with the accompanying drawings, is a specification.

. This invention relates to improvements in stone grinding and polishing machines and it 1s carried out as follows, reference being had to the accompanying drawings, wherein Figure 1, represents a top plan view of the Invention. Fig. 2', represents a side elevation of the same. Fig. 3, represents a cross section on the line 33 in Fig. 1 partly shown in elevation. Fig. 4, represents a detail 1on gitudinal section on the line 4et shown in. Fig. 2. Fig. 5, represents a detail longitudinal section on the line 5-5 shown in Fig. 2. Fig. 6, represents a detail section on the line 66 shown. in Fig. 5. Fig. 7, represents a deta l top plan view of the expansive yield- 1n g guide plates for the grinder shaft; and Fig. 8, represents a similar top plan view of sa d guide plates shown as separated from each other.

Similar letters refer to similar parts wherever they occur on the different parts of the drawings.

A represents a suitable base or'floor of the building in which the grinding and polishing machine is located and B, B, represent the upright portions of the frame work of the machine secured at the top by means of suitable stays or braces C and 0' Band D as shown in the drawings.

E represents the stone block that is to be ground or polished.

In bearings in the upper part of the frame work of the machine is located the driving shaft F which may be set in rotary motion preferably by belt power applied to a pulley F thereon as shown in Fig. 1.

To the shaft F is secured a bevel gear f the teeth of which mesh in a bevel gear or pinion g secured to the vertical shaft G which is journaled in suitable bearings G and G secured to a post or standard B that forms part of the frame work of the machine as shown in Fig. 3. On said vertical shaft G is attached to it which is carried over a roller 9' on the bearing G and attached to the frame or link Has shown in Fig. 3.

To the shaft is is secured a ratchet wheel 70" provided with a pawl k for the purpose of holding the link or frame H at any desired elevation as is common in machines of this kind.

In the outer end of the link I is journ aled the grinder shafti to the lower end of which is universally jointed the rotary grinder disk L of a construction as is common in stone grinding and polishing machines and need therefore not herein be described in detail.

The grinder shaft 2' is set in a rotary motion from the shaft G by means of a belt M leading from a pulley m on the shaft G to a pulley h on the spindle h as shown.

From the spindle h the rotary motion is conveyed to the grinder shaft i by means of a belt N carried on pulleys secured to shafts h and 11 as shown in Figs. 1, 2 and 3.

I use in connection with the above described machine an automatic feeding mechanism which is constructed as follows: The grinder L is automatically fed forward and back in direction of arrows X and Y shown in Fig. 1 by means of a traversing reciprocating frame 0 which is guided in suitable bearings in cross bars P which are vertically adjustable in a stationary bearing 0" secured to the upper cross bar 0 as shown in Figs. 1 and 2. The lower end of the shaft Q is guided preferably in a slotted bearing p secured to the vertically adjustable brace P and provided preferably with springs 10 p for normally holding the lower end of said shaft Q in a central vertical position. To the lower end of the said shaft Q is secured a small pinion q the teeth ofwhich aremade to engage in pegs 0' 0' of a rack on the reciprocating frame 0 as shown in Figs. 1, 2, 5, and 6. As the shaft Q rotates the teeth of its lower pinion q engage on one side of the pins or rack 0' until the end of the latter is reached when the pinion swings round to the opposite side of the rack by the action of the springs p'p causing the motion of the frame 0 to be reversed thus causing a reciprocating motion to be automatically imparted to said frame 0 as long as the shaft Q continues to rotate. On the reciprocating frame 0 is secured a cross bar R having a series of notches r, r,

and to said notched bar is ad justably secured a slmllar expansive or yielding bar R having notches 'rr' corresponding in position to the notches r, a", on the stationary bar R as shown in Figs. 1, 3, 7 and 8.

In practice I prefer to hold the notched bars RR yieldingly connected bymeans of springs S, S, shown in Figs. 1 and 7.

I have described one bar R as rigid on the frame 0 and the other It yielding relative to the stationary bar but this is not essential as both bars may be yielding to and from each other without departing from the essence of my invention.

On thegrinder shaft 2' is loosely slipped a ring or collar T to which are connected the chains, ropes or cords U and V and sruided on suitable pulleys U U" and V V" and v provided at their ends with the respective balance weights U V as shown in Figs. 1, 2 and 3.

The operation is as follows: By the mechanism described the rotary grinder shaft 2' is automatically moved forward and back in the direction of the arrows X andY shown in Fig. 1. As it is being moved to the end of its stroke in direction of the arrow X the weight V comes in contact with the cross bar P or other abutment by which the cord V is tightened causing the grinder shaft 1' to be moved toward the right into another set of notches on the yielding grinder shaft supports R R and causing it to be held in such new notches during the return stroke of the frame 0. As the rotary grinder shaft 2' is being moved to the end of its stroke in the direction of the arrow Y in Fig. 1, the weight U comes in contact with the opposite cross bar P or other abutment by which the cord U is tightened causing the grinder shaft 2' to be moved toward the left into another set of notches on the yielding grinder shaft support R R thus imparting to the grinder shaft an automatic motion in the direction of the arrows X and Y Fig. 1, but also causing it to be moved automatically in a direction at right angles to said arrows as herein above described. By adjusting the lengths of the ropes or chains U, V, any desired lateral automatic adjustment of the grinder shaft may be provided; and it will thus be seen that the rotary grinder or polishi'ngtool is automatically moved during its rotation forward and back, and right and left so as to reach all parts of the surface of the stone that is being ground or polished; and in this manner a great saving in time and labor is obtained as the machine will take care of itself after once being set in operation until the stone is evenly ground or polished as the case may be, and as itneeds no special supervision one and the same man may tend any desired number of machines.

What I wish to secure by Letters Patent, and claim, is

1. In a stone grinding and polishing machine a horizontally and vertically adjustable rotary grinder and polisher tool combined with an automatic reciprocating frame for guiding the tool forward and back relative to the stone that is being operated upon substantially as and for the purpose set forth.

'2. In a stone grinding and polishing machine a horizontally and vertically adjust-' able rotary grinder and polisher tool cornbined with an automatic reciprocating frame for guiding the tool forward and back relative to the stone that is being operatedupon and automatic mechanism substantially as described for guiding the rotary tool at a right angle to the path of the reciprocating frame as and for the purpose set forth.

3. In a stone grinding and polishing machine a horizontally and vertically adjustable rotary grinder and polisher tool combined with an automatic reciprocating carrying frame for guiding the tool forward and back relative to the stone that is being operated upon and a pair of notched spring pressed bars R, R, arranged upon said reciprocating frame and weights U V connected by means of cords or chains to the rotary tool shaft substantially as and for the purpose set forth.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, on this 16th day of May, A. D. 1894.

JOHN LAVERS.

Witnesses:

ALBAN ANDREN, KITTIE M. HANSON.

ICO 

